I was on birth control pills for 8 years straight. Nobody ever told me that you have to stop taking them once in a while to give your body a chance to rest from them. I don't think a few months at a time would do as much damage as years at a time. I wish I had known about low carbing when I was your daughter's age or I could have avoided a LOT of problems later on. Kids and even adults can be so cruel when your body shape doesn't match the socially accepted norm. Docs still can't figure out how I got pregnant since a couple of years of fertility drugs did nothing for me and we had given up and were considering adoption. Even the gynecologist (who is also the fertility specialist who said it just wasn't going to happen) who saw me for all my pregnancies just shrugs and says "it's a miracle".